generate-repology-metadata: attempt to fix github action error

Logs show:
```sh
dirname: missing operand
Try 'dirname --help' for more information
```

Either quoting problem or maybe the CI uses some arcane shell

scripts/repology/generate-repology-metadata.sh

@@ -20,7 +20,7 @@
 
 set -e
 
-BASEDIR=$(dirname "$(realpath "$0")")
+BASEDIR=$(dirname "$(realpath \"$0\")")
 export TERMUX_ARCH=aarch64
 
 check_package() { # path